Inductor electric generator.



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UNITEDg sTArs PATENT OFFICE'.

PARNELL BABBIDGE, OF NEUTRAL BAY, NEAR SYDNEY, NEW SOUTH WALES, AUSTRALIA.

INDUCTOR ELECTRIC GENERATOR.

No. 883,346. Specification of Letters Patent. Patented March 31, 1908.

Application filed October 31, 1906. Serial No. 341,411.

T 0 all whom it may concern;

Be it known that l, PARNELL RABBIDGE, a subject of the King of Great Britain and Treland, and resident of laters Road, Neutral Bay, near Sydney, New South Wales, Australia, have invented new and useful improvements in an Inductor Electric Generator, of which the following is a specification.

This invention relates to improvements in the construction of that type of electric generator known as the inductor generator, and its object is to simplify the construction of such an apparatus by using one stationary coil. By winding another coil ol wire around the irst coil, the second coil will act as a primary to inductively connect the outer circuit with it.. In such a case the whole might be used as an induction coil, or transformer, of a telephone or telegraph circuit. lf an alternating `current be conducted through the line coil, the latter will act as a bell coil to vibrate an armature similar to that usually employed with a magneto bell, when an alternating' current is passed through it.

In giving effect to the invention a base plate of solt iron is firmly secured to one of the poles of the iield magnet, and to this base plate two concentric iron cylinders, are firmly attached. The base plate and cylinders are divided diametrically into two halves, for the purpose-(a) of permitting the coils to be inserted with facility, and (l2) for preventing eddy currents from circulating round the cylinders, and thereby heating them.

Projecting inwards from the extreme end of the internal periphery of the larger cylinder are a number of radial projections, and projecting outwards from the extreme end of the external periphery of the smaller cylinder or core are a corresponding` equal number of radial projections which alternate with the other projections. Around the inner cylinder or core (between the core and the cylindrical casing) is wound a coil of wire insulated lrom its surroundings, and, when used as a telephone instrument, around the peripheral insulation is wound a second coil of coarser wire, the two coils reposing within the annular space between the two cylinders, or circles of projections.

When applied to a telephone system,V the inner coil of fine wire is connected to line at one end and to earth or return at the other end, and the outer coil of coarser wire is conneeted to the telephone or telegraph circuit. When applied to generating alternating currents for lighting and similar purposes, the annular-space, between the cylinders, or the circles ofprojections, will contain only one coil of suitable sized wire, which will be connected direct to the work in the usual way, and the 'lield magnet will also be electrically excited.

On the same axis as the cylinders, or circ-les of projections, and revolving before the external faces of the projections is an inductor, consisting of a brass huby with iron projections, such projections being half the total number of the projections from the pole or poles of the field magnet. This inductor will be rotated by some external and independent power.

The base plate may be dispensed with and the cylinders, or circles of projections, may be secured direct to one or both poles of the ,field magnet, the base plate being merely a convenient mode of attaching the cylinders or projections to the pole.

ln the accompanying drawings tll`igure 1 is a side elevation of the apparatus. Fig. 2 is a transverse vertical section of the same, taken on the line 1-2. Fig. 3 is a front elevation of the inductor. Eig. 4 is an underneath plan of Fig. 1, partly in section, taken on the line 3-4- Fig. 5 is a longitudinal vertical section of the coils taken on the line 5 6 of Fig. 2.

A is the N pole, and B the S pole oi the Vfield magnet; C the base plate secured to the S pole; D the outer iron cylinder, E the inner iron cylinder concentric with D; d, d, iron projections inwards from the end of the cylinder (D), c, e, iron projections outwards from the end of the cylinder (E). F, the

main coil that is wound around E, and which may be used 'for either purpose. f, the insulation around-F; G, the second coil wound around the peripheral part of the insulation (f) when used for telephones; g is the insulation about G H is the brass hub of the inductor, which rotates upon the axis c; h, h, are iron projections from the hub H, and constitute the inductors. The base -plate (C) and the two'cylinders (D and E) aremade in two halves (as shown by the diametrc line Z) for the purpose-(a) of inserting the coils (E, G) with facility; and (t) for preventing eddy currents from circulating round the cylinders (D, E), and thereby heating them.

The inductor, when rotated, will conduct the magnetic 'flux alternately `from the N pole-(a) through the projections (d) and the outside cylinder (D), to the S pole, and

(b) through the projections (e) and the inside cylinder (E) to the S pole. This will have the saine effect as though the flux were reversed inside the coils only.

When the apparatus is used as a telephone instrument, one iron pole (J) is connected to a projection (e), and another pole (K) is connected to a projection (d). Below these poles is a vibrating armature (L) pivoted at t to an iron support (M) connected t0 the N pole of the field magnet. This 'combination will cause the tongue or hannner (N) of a bell to vibrate and ring the bell.

Having now described iny invention, what I claiin as new and desire to secure by Letters Patent is A horse shoe ield magnet, a core, and a cylindrical casing concentric therewith, both attached to one of the poles of the field inagnet, a coil or coils wound upon the core between the core and the casing, projections, at regular intervals, from the edge of the core,

and roni the edge of the casing, alternating In testimony whereof l have signed my Y narne to this specification in the presence of two subscribing witnesses.

l PARNELL RABBIDGE. Witnesses:

ALBERT MAssEY, VINCENT NEWTON. 

